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Thursday, 7 April 2016

BCA Semester 4: Computer Networks - Circuit Switching vs Data Gram vs Virtual Circuit

 Computer Networks
Circuit Switching vs Data Gram
vs Virtual Circuit

BCA Semester 4: Computer Networks -  Circuit Switching vs Data Gram vs Virtual Circuit


Q: What are the differences among Circuit Switching, Data Gram and Virtual Circuit?


Answer:


SNo. Circuit Switching Datagram  Virtual-Circuit 
1.   Dedicated transmission path  No dedicated path  No dedicated path 
2.  Continuous transmission of data  Transmission of packet  Transmission of packet 
2.  Fast enough for interactive  Fast enough for interactive  Fast enough for interactive 
4.  Messages are not stored  Packets may be stored until transmitted  Packets may be stored until delivered 
5.  The path is established for entire conversation  Route established for each packet  Route established for entire conversation

6.  Call set-up delay, transmission delay  Packet transmission delay  Call setup delay, packet transmission delay 
7.  Busy signal if called party busy  Sender may be notified if packet not delivered  Sender notified of connection denial 
8.   Overload may block call setup; no delay for established calls  Overload increases packet delay  Overload may block call set-up; increases packet delay 
9.   Usually no speed or code conversion Speed and code conversion  Speed and code conversion 
10.   Fixed Bandwidth  Dynamic use of bandwidth  Dynamic use of bandwidth 
11.  No overhead bits after call setup  Overhead bits in each packet  Overhead bits in each packet 


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